Printing machine



Jan. 13, 1931. A. F. MCCOLLUM PRINTING MACHINE Filed Dec. 1

Merv/fork I a; /;c2s My 7 Patente cl Jan. 13, 1931 UNITED STATES PATENT OFFICE ALFRED I. IOGOLLUI, OI BLOOHSBUBG, PENNSYLVANIA, ASSIGNOB "1'0 THE MAGEE CARPET 00., OF BLOOHSBUBG, PENNSYLVANIA, A OORPOBATION PENNSYL- VANIA' PRINTING MACHINE Application fled December 17, 1827. Serial No. 240,728.

This invention relates to im rovements in fabric printing machines, an relates primarily to improvements in the rollers by means of which the dye or coloring medium is distributedover the faces of the printing elements prior to impressing the latter upon the fabric. v

Considerable difficulty has been experienced in obtaining a roller having surface characteristics affording a desirable distribu- P tion of the colorin material over the faces of the printing bloc orother elements, and by the present invention I provide a distributing roll having surface characteristics rendering it highly eificient in the operation which the roll per-forms.

The roll is particularly useful in connection with printing blocks or elements having roughened or recessed surfaces, such as those disclosed in my U. S. Patent 1,771,341, dated July 22, 1930, since it functions efliciently to distribute the coloring material over the said faces and is not wearing on the block to the same extent as other types of roll.

In the attached drawings:

Figure 1 is a view in perspective of a roller made in accordance with my invention, and

lBlig. 2 is a transverse section through the re I have discovered that pile fabrics and particularly that type of pile fabric in which the pile loops remain intact after the pile wires are withdrawn possess certain physical characteristics rendering them particularly desirable and useful as facings for rollers of the stated 'type.

In applying the fabric to the roller, I prefer to employ the method illustrated in Fig. 1, in which a relatively narrow and continuous strip is wound spirally upon the surface of the roller so as to form a continuous and uninterrupted facing covering the entire cylindrica surface of the roll. Preferably the fabric is secured in position by a suitable cement, although other means may be employed without departure from the invention.

It will be noted that b applyin the fabric as described abov t e lines 0 juncture between the convolutlons extend helically around the roll and are, therefore, angular to the axis of the latter. With this arrangement, these juncture lines cannot affect the umform application of the ink or dye to the surface of the printing member, as would be the case where-the seam to extend longitudinally of the roll or in a truly circumfer ential manner.

As stated above, a pile fabric of the type in which thepile loops are leftintact has been found particularly desirable for the practice of this invention. Such a fabric is illustrated clearly in Fi 2, and it will be noted that the surface 0 the roll when this fabric is employedis composed of a landity of closely arranged outwardl pro ecting loops each of which individualfy, functions by capillary action to retain a definite quantity of'the coloring medium. Not. only does the surface maintain a predetermined and desirable quantity of'the dyestufi, but when brought into contact with the surface of the impression member delivers to the latter a predetermined desirable quantity of the substance with an entirel even distribution over the entire surface. T e quantity of material a plied in successive operations is remarka ly uniform.

I claim:

1. In a printing machine, the combination of a printing member, and an inking roll therefor, said inking roll consisting of a base roll and an uncut pile fabric applied to the face of said roll so that the pile loops project to form the effective inking surface.

2. In a printing machine, the combination of a printing member, and an inking roll therefor, said inking roll including a surface consisting of a plurality of closely arranged loops of textile material projecting substantially radially from the roll to form the effective inking surface.

. ALFRED F. MoCOLLUM. I 

